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The IUCN lists Commerson's dolphin as Least Concern in its Red List of Threatened Species. The proximity of the dolphin to the shore makes accidental killing in gillnets a common occurrence. The dolphin was killed for use as crab bait by some Argentinian and Chilean fishermen in the 1970s and 1980s, but this practice has since been curtailed. [2]
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The long-finned pilot whale (Globicephala melas) is a very large dolphin, measuring five to six meters long and weighing one to three tons. It is an entirely black dolphin (apart from a white ventral plastron), with a round head, almost without a differentiated beak, and a short, backward-arched dorsal fin. It lives in groups of several dozen ...
A Pacific white-sided dolphin flips out of the water in the Cordell Bank National Marine Sanctuary off California. These dolphins keep close company. [17] White-sided dolphins swim in groups of 10 to 100, and can often be seen bow-riding and doing somersaults. [6] [18] Members form a close-knit group and will often care for a sick or injured ...
The northern right whale dolphin has a streamlined body with a sloping forehead, and a slimmer build than other delphinids. It lacks any fin or ridge on the smoothly curving back. [4] [5] Its body is nearly all-black with a white ventral marking, extending forward as a narrow band from the caudal peduncle to
The dusky dolphin has a distinctive colouration that resembles the Pacific white-sided dolphin. It has a dark grey or black upper area, light grey face, chest area, and flank patch, and a white underside. The flank patch has a branch that extends over the back and can reach the blowhole.
[10] [11] More extensive anomalous pigmentation has been observed, with records of pure all-white individuals, [12] [13] as well as melanistic (all-black) individuals. [ 14 ] [ 15 ] In 1998, a potential hybrid of a southern right whale dolphin and a dusky dolphin ( Lagenorhynchus obscurus ) was observed and subsequently described in 2002.